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A monograph of the British fossil Crustacea Pl. XV . Lalsonto graph ' Soc TJ STLiniIASr CHUSTACEA Pl IV iiifflm DeLetlith TWaHer Tmp PTERYGOTUS BILOBUS freer perornatus IT SiIzunasK oflaruulcsJzir Pl XV Illustration biodiversitylibrary org title Woodward Henry NameFound Pterygotus bilobus NameConfirmed Pterygotus